Merge branch 'has_parent' into 'master'

Re-enable has_parent optimization

Closes #212144

See merge request gitlab-org/gitlab!32827

app/models/namespace.rb

@@ -277,7 +277,7 @@ class Namespace < ApplicationRecord
   end
 
   def has_parent?
-    parent.present?
+    parent_id.present? || parent.present?
   end
 
   def root_ancestor